Question

我有一张旧表，结构如下：

UserId GUID
SelectionId GUID 
DateSelected DATETIME

将它映射到单个类很容易，但我想将它映射到两个类，因为我总是将这个表排队到UserId

public class User
{
    Guid UserId {get;set;}
    IEnumerable<UserSelection> UserSelection {get;set;}
}

public class UserSelection
{
    public Guid SelectionId { get; set;}
    public DateTime DateSelected { get; set;}
}

我有可能在NHibernate吗？

Answer 1

我还没有尝试，但你可以使用 subselect feature使用映射到查询，将是这样的：

public class UserMap : ClassMap<User>
{
    public UserMap()
    {
        Subselect("SELECT DISTINCT UserId FROM OldTable");

        ReadOnly();

        Id(x => x.UserId);

        HasMany(x => x.UserSelection).Table("OldTable").KeyColumn("UserId");
    }
}

public class UserSelectionMap : ClassMap<UserSelection>
{
    public UserSelectionMap()
    {
        Table("OldTable");

        Id(x => x.SelectionId);

        Map(x => x.DateSelected);

        References(x => x.User).Column("UserId").Not.Nullable();
    }
}

Nhibernate映射大师 - ＆gt;来自同一表的详细信息类

1 个答案: